Jeffrey A Zapfe

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Although genetic influences on individual differences in activity level (AL) are well documented, few studies have considered the etiology of AL from a contextual perspective. In the present study, cross-situational and context-specific genetic effects on individual differences in AL at age 2 were examined. The AL of 312 twin pairs (144 monozygotic and 168(More)
Transportation-related environmental noise studies, particularly those associated with rail traffic, often require long term measurements near existing rights of way. In addition to the sound produced by passing vehicles, it is also useful to know their speed. Previously, speed measurements have generally required an additional piece of instrumentation,(More)
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